diff --git a/grafana.ini b/grafana.ini
index 08093a1bfb5fbf37470ccae5167c0fa48ed68655..9c3e4cfed0e7d22bc850be04bc3ddc1014a618d1 100644
--- a/grafana.ini
+++ b/grafana.ini
@@ -908,7 +908,7 @@ disable_sanitize_html = true
 # Instruct headless browser instance to use a default timezone when not provided by Grafana, e.g. when rendering panel image of alert.
 # See ICU’s metaZones.txt (https://cs.chromium.org/chromium/src/third_party/icu/source/data/misc/metaZones.txt) for a list of supported
 # timezone IDs. Fallbacks to TZ environment variable if not set.
-;rendering_timezone =
+rendering_timezone = UTC
 
 # Instruct headless browser instance to use a default language when not provided by Grafana, e.g. when rendering panel image of alert.
 # Please refer to the HTTP header Accept-Language to understand how to format this value, e.g. 'fr-CH, fr;q=0.9, en;q=0.8, de;q=0.7, *;q=0.5'.
@@ -989,7 +989,7 @@ enable = ngalert
 ;use_browser_locale = false
 
 # Default timezone for user preferences. Options are 'browser' for the browser local timezone or a timezone name from IANA Time Zone database, e.g. 'UTC' or 'Europe/Amsterdam' etc.
-;default_timezone = browser
+default_timezone = UTC
 
 [expressions]
 # Enable or disable the expressions functionality.